The Piggyback Slider configuration is two Sliders:
• | Slider(A) : moves along the X-axis† of the Mechanism-Plane |
• | Slider(B) : mounted to Slider(A), and moves along the Y-axis† of the Slider(A) |
The Piggyback Slider Configuration is only one way to model an XY-Path.
You can also use a Motion-Path. See: Motion-Path and Blend-Curves.
† The Sliders do not need to be in the X-axis and Y-axis directions or even it right-angles to each other. We describe them in these directions for convenience only.
For example, they may be in the Radial and Tangential direction relative to a radius line of a circle.
Mechanical Systems that follow the 'XY'-Path:
Linear-Slides (Slide-ways + Slide-blocks)
o | The Piggyback Sliders are modelled in the same way as the Linear-Motion Technology' (the motors and the mechanics). |
o | The motors that drive the 'Sliders' have the same nominal* motion as the Piggyback Sliders. See Step 11.1 |
* For example, a motor may rotate a Pulley to move a Belt, or a Ball-Screw to move a Nut. In each case, the motors rotate a different number of rotations, but their rotation is a linear relationship to the Slider's motion.
Linear Slides with Dyads
a. | Use linear-slides to design an XY-table. |
b. | Connect between the slide-blocks and the machine-frame. |
c. | Use cams or servomotors on the Machine Frame to drive the Dyads and thus the XY-table |
Design and add motions to the XY-table directly. MechDesigner will use inverse-kinematics to calculate the motions for the cam-followers or servomotors - See Step 11.2
Translating Beam (a Part that moves on the Mechanism-Plane but does not rotate)
o | It is possible to configure a translating-beam that does not need linear-slides. |
o | Look at this video. This example happens to show 3 independent axes to control the motion of a Beam. In this case the motion of the beam can be specified to translate or rotate. |
o | Use Piggyback Sliders to specify the XY-Path, even though they are not in the mechanical system. See Step 11.3. |
Technical Note:
Rectilinear Translation: All points in a Part have the same and parallel motions.
Curvilinear Translation: All points in a Part have the same, but not necessarily straight, motions.
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